databaseChangeLog() {
    changeSet(id: "app-20190507-01", author: "chenjingjing") {
        sql(
                "CREATE TABLE app (\n" +
                        "  `id` BIGINT NOT NULL AUTO_INCREMENT COMMENT 'id',\n" +
                        "  `key` VARCHAR(100) NOT NULL COMMENT '项目标识',\n" +
                        "  `description` VARCHAR(200) DEFAULT '' COMMENT '项目描述',\n" +
                        "  `owner` VARCHAR(100) COMMENT '项目管理员',\n" +
                        "  `date_created` TIMESTAMP COMMENT '创建日期',\n" +
                        "  `create_by` VARCHAR(100) COMMENT '创建人',\n" +
                        "  `date_modified` TIMESTAMP COMMENT '修改日期',\n" +
                        "  `modified_by` TIMESTAMP COMMENT '修改人',\n" +
                        "  PRIMARY KEY(`id`),\n" +
                        "  UNIQUE app_idx_key(`key`)\n" +
                        ")\n" +
                        "ENGINE=InnoDB DEFAULT CHARSET=utf8\n"
        )
    }
}